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The carry look ahead adder is based on the principle of looking at the lower order bits of ________ and ________ if a high order carry is generated.

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The carry look ahead adder is based on the principle of looking at the lower order bits of ________ and ________ if a high order carry is generated.

(a) Addend, minuend

(b) Minuend, subtrahend

(c) Addend, minuend

(d) Augend, addend

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Question is taken from Fast Adder & Serial Adder in chapter Arithmetic Circuits of Digital Circuits

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The correct choice is (d) Augend, addend

Explanation: The carry look ahead adder is based on the principle of looking at the lower order bits of the augend and addend if a high order carry is generated. A carry look ahead adder is a type of adder which reduces the propagation delay.

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